Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: [MA] Surface magnetism IV
O 81.5: Vortrag
Donnerstag, 17. März 2011, 16:15–16:30, HSZ 103
Charge-transfer correlation effects on the spin state of magnetic molecules at a metal interface — •Sebastian Stepanow1, Piter Miedema2, Aitor Mugarza1, Gustavo Ceballos1, Paolo Moras3, Julio Cezar4, Carlo Carbone3, Frank de Groot2, and Pietro Gambardella1 — 1ICN Barcelona — 2U Utrecht — 3CNR Trieste — 4ESRF Grenoble
We investigate the hierarchy of local correlation and hybridization effects in metal-organic molecules adsorbed on metals. Using x-ray magnetic circular dichroism and ligand field multiplet calculations, we demonstrate that the 3d electronic ground state of monolayer metal-phthalocyanine (CoPc, FePc) on Au(111) is given by the coherent superposition of two charge states, dnE+dn+1, where E represents a substrate electron bound to the central metal ion and dn the many-body ionic orbital configuration of the unperturbed molecule. These results differ from previous models of hybrid metal-organic systems, and provide a consistent description of their magnetic properties in terms of spin and orbital multiplicity.